Backplane
The Stargazer Backplane was an 8 socket RC2014 backplane module, originally inteded for Z80 based PCs.
It features 40 parallel pin connections for the 8 card slots.
The Stargazer Backplane also featured a USB-PD compatible USB-C module to provide up 5V/3A for use by the attached cards.
Pinout
The following pinout was used for the Stargazer Backplane:
| Pin Number | RC2014 Name | Anachro Stargazer Name | Notes |
|---|---|---|---|
| 1 | A15 | CARD1-GO | |
| 2 | A14 | CARD2-GO | |
| 3 | A13 | CARD3-GO | |
| 4 | A12 | CARD4-GO | |
| 5 | A11 | CARD5-GO | |
| 6 | A10 | CARD6-GO | |
| 7 | A09 | CARD7-GO | |
| 8 | A09 | CARD8-GO | This was actually a mistake. I only needed 7 select lines, but had already soldered the following SPI pins. |
| 9 | A08 | CARDx-COPI | |
| 10 | A07 | CARDx-SCK | |
| 11 | A06 | CARDx-CSn | |
| 12 | A05 | CARDx-CIPO | |
| 13 | A03 | RESERVED | Not used by the Stargazer |
| 14 | A02 | RESERVED | Not used by the Stargazer |
| 15 | A01 | RESERVED | Not used by the Stargazer |
| 16 | A00 | RESERVED | Not used by the Stargazer |
| 17 | GND | GND | |
| 18 | 5v | +5v | |
| 19 | M1 | 3v3 | This was used to supply power to the keyboard from the CPU |
| 20 | Reset | Reset | |
| 21 | Clock | SWDIO-1 | |
| 22 | INT | SWCLK-1 | |
| 23 | Nreq | SWDIO-2 | |
| 24 | Wr | SWCLK-2 | |
| 25 | Ro | SWDIO-3 | |
| 26 | IORQ | SWCLK-3 | |
| 27 | D0 | SWDIO-4 | |
| 28 | D1 | SWCLK-4 | |
| 29 | D2 | SWDIO-5 | |
| 30 | D3 | SWCLK-5 | |
| 31 | D4 | SWDIO-6 | |
| 32 | D5 | SWCLK-6 | |
| 33 | D6 | SERIAL2-TX | This was the Keyboard Serial Port |
| 34 | D7 | SERIAL2-RX | This was the Keyboard Serial Port |
| 35 | Tx | SERIAL1-TX | This was the Display Serial Port |
| 36 | Rx | SERIAL1-RX | This was the Display Serial Port |
| 37 | USR1 | SWDIO-7 | This was used for the Keyboard SWD |
| 38 | USR2 | SWCLK-7 | This was used for the Keyboard SWD |
| 39 | USR3 | SWDIO-ARB | |
| 40 | USR4 | SWCLK-ARB |